Решить уравнение (tgx)^4+(ctgx)^4+(tgx)^2-(3/4)*(ctgx)^2=2
[m](\frac{sin^2x}{cos^2x})^2+(\frac{cos^2x}{sin^2x})^2+\frac{sin^2x}{cos^2x}-\frac{3cos^2x}{4sin^2x}=2[/m] [m](\frac{1-cos2x}{1+cos2x})^2+(\frac{1+cos2x}{1-cos2x})^2+\frac{1-cos2x}{1+cos2x}-\frac{3(1+cos2x)}{4(1-cos2x)}=2[/m]